﻿<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Calculator</title>
    <style type="text/css">
        table {border-spacing: 0px; border-collapse: collapse;}
        td {padding: 0px;}
        input {width: 100%; height: 40px; font-size: 20px;}
        input.textbox {text-align: right; width: 160px; height: 30px}    
    </style>
</head>
<body>
    <form>
        <table border="1">
            <tr>
                <td colspan="4">
                    <input type="text" class="textbox" value="123"/>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="button" value="1"/>
                </td>
                <td>
                    <input type="button" value="2"/>
                </td>
                <td>
                    <input type="button" value="3"/>
                </td>
                <td>
                    <input type="button" value="+"/>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="button" value="4"/>
                </td>
                <td>
                    <input type="button" value="5"/>
                </td>
                <td>
                    <input type="button" value="6"/>
                </td>
                <td>
                    <input type="button" value="-"/>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="button" value="7"/>
                </td>
                <td>
                    <input type="button" value="8"/>
                </td>
                <td>
                    <input type="button" value="9"/>
                </td>
                <td>
                    <input type="button" value="*"/>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="button" value="0"/>
                </td>
                <td>
                    <input type="button" value="."/>
                </td>
                <td>
                    <input type="button" value="/"/>
                </td>
            </tr>                
        </table>
    </form>
</body>
</html>
